The Belarusian government, I believe, has said that they have invited Russian troops into their country. I would like to fact-check that to be certain but I believe it to be the case. I'm not aware of comments about exercises. However, I would note that the Russian government has offered no explanation for its troops in Belarus, and that is notable to us.
On the documents, l think it's well known that both NATO and the United States have presented papers to the Russian authorities in response to their demands. The papers that you mention, including the U.S. paper, have been consulted with Canada in confidence. We are not at liberty to discuss diplomatic actions of other governments that are discussed with us in confidence, but I can speak later to some of the substance of the NATO paper if that is of interest.